Iranian Scientific Fisheries Journal http://isfj@ifro.ir
ISFJ - Journal articles for year 2018, Volume 26, Number 6Yektaweb Collection - http://www.yektaweb.comen2018/3/10Feasibility study of cage fish farming based on physico-chemical parameters effective on water quality and eutrophication trend at less than 15 meter depth in southeast region of the Caspian Sea (Goharbaran region)http://isfj.ir/browse.php?a_id=1777&sid=1&slc_lang=en
<p>The aim of this project was to study the feasibility of cage fish farming based on the evaluation of physico-chemical parameters effective on water quality and the trophic status (scaled and unscaled) at various depths of water and different months in the southeast of the Caspian Sea (Goharbaran region). The total numbers of 154 samples were collected at eight stations from three depths (5, 10 and 15 m) during 12 months. Results showed that the amounts of water temperature, transparency, pH, dissolved oxygen, BOD5, total alkalinity and TSS ranged from 9.00 to 29.00˚C, 0.50 to 12.00 m, 8.05 to 8.74, 5.76 to 12.85, 21 to 195 and 0.00 to 0.12 mg/l, respectively. In addition, the values of NH<sub>4</sub><sup>+</sup>, NH<sub>3</sub>, NO<sub>2</sub><sup>-</sup>, NO<sub>3</sub><sup>-</sup> and PO<sub>4</sub><sup>-3</sup> ranged from 0.007 to 0.051, 0.001 to 0.010, 0.002 to 0.015, 0.043 to 0.477 and 0.014 to 0.077 mg/l, respectively. Scaled and unscaled trophic index were 3.42-5.52 and 2.61-5.85, respectively. Therefore, the proper temperatures for cultivation of salmonids species in this area were begun in October and ended in March. In the current study, results of pH and dissolved oxygen were consistent with the standard range of pH (7.80-8.50) and dissolved oxygen (>5 mg/l) for cage fish farming. Although, Goharbaran region were appropriate for cage fish farming in terms of&nbsp; nutrients, but this region was evaluated as mesotrophic (5.97&plusmn;0.73) with high risk of eutrophication (>4).<br>
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H. Nasrollahzadeh Saravi Effects of environmental parameters on dinoflagellates cysts of Gonyaulacales and Gymnodiales in Oman Sea coasts and the Strait of Hormuzhttp://isfj.ir/browse.php?a_id=1818&sid=1&slc_lang=en
<p>The purpose of this study was to evaluate the effects of environmental parameters on the dinoflagellates cyst abundance of Gonyaulacales and Gymnodiales orders in the sediment of Oman Sea coastal regions and the Strait of Hormuz in winter and spring 2015. Dinoflagellate cyst study helps to identify key areas for&nbsp; the feature bloom of harmful species. For this purpose, sediment sampling was carried out by Grab (Ekman) at 15 stations located in the Pasabandar, Ramin, Konarak, Galak and the first Tiab estuary in the Strait of Hormuz. Salinity, temperature, acidity and depth of water column were measured in each station. The sediment grain size and the total organic matter content of the sediment were measured in the laboratory and dinoflagellate cysts were isolated, identified and counted. The relationship between the environmental parameters and the species of dinoflagellate cysts was studied by the ordination method of canonical correspondence analysis(CCA). The ordination results of CCA showed that the abundance of dinoflagellate cysts was significantly affected by the environmental parameters and the sediment grain size (P<0.05). In general, the abundance and distribution of dinocysts in the winter was affected by the percentage of silt, sand, silt-clay and the total organic matter (TOM), whereas the abundance and distribution of dinocysts in the spring was affected by the temperature and depth of water, as well as the percentages of&nbsp; sand, silt, silt-clay, clay and TOM.</p>
G. Attaran FarimanEvaluating the effects of different levels of astaxanthin pigment on skin color and tissue texture of Parrotfish (Cichlasoma synspilum ♀ × Cichlasoma citrinellum ♂) using RGB and Lab techniqueshttp://isfj.ir/browse.php?a_id=1673&sid=1&slc_lang=en
<p style="text-align: justify;">Color is the most important characteristic of the ornamental fish. The use of pigments for changing the color of skin and carcasses has become more prominent in recent years. In the present study, the effects of astaxanthin pigment on skin color and tissue of parrotfish were studied using RGB and Lab techniques. Sixty parrotfish (with the average weight of 26.5&plusmn;1.87 g) were distributed in different 50-liter volumetric aquariums (30&times;40&times;60 cm) and five dietary treatments with 3 replications for each treatment were considered. Treatments including the control (non-pigmented diet) and diets containing 0.2, 0.5, 1 and 1.5% of astaxanthin were prepared. After eight weeks of feeding fish with various treatments, four fish were taken from each treatment and their back muscles were used for the preparation of identical fillets. RGB and Lab techniques were used for the evaluation of the color of skin and muscle of fish. The results showed that change of color in the carcass texture in terms of the L component in all fish fed with the diets containing pigments were significantly decreased as compared to that of the control group (P<0.05). Change of color in the carcass texture in terms of the a component in all fish fed with the diets containing pigments except for the treatment containing 0.2% of astaxanthin were significantly increased as compared to that of the control group (P<0.05). Change of color in the carcass texture in terms of the b component in all fish fed with the diets containing pigments were significantly increased as compared to that of the control group (P<0.05). Change of color in the carcass texture in terms of the C<sub>ab</sub> factor in all fish fed with the diets containing pigments except for the treatment containing 0.2% of astaxanthin were significantly different as compared to that of the control group (P<0.05). Change of color in the carcass texture in terms of the H<sub>ab</sub> factor in all fish fed with the diets containing pigments were significantly decreased as compared to that of the control group (P<0.05). Data obtained from the skin color assessment using the RGB method indicated that the color of fish skin was dark at first and gradually with increasing the levels of astaxanthin it became brighter and finally it turned to orange-red color. Overall, the level of 0.5% of astaxanthin in parrotfish diet can be used to create red-orange color. Moreover, the results of the present study indicated the efficacy of RGB and Lab techniques in evaluating the color of fish skin and carcasses.<br>
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E. Ebrahimi Risk assessment of some potentially toxic elements pollution in the muscle and liver of Longtail tuna (Thunnus tonggol) and Abu mullet (Liza abu) for human consumption in the Hormozgan Provincehttp://isfj.ir/browse.php?a_id=1821&sid=1&slc_lang=en
<p>TThe objectives of the present study were assess the concentrations of heavy metals (Cd, Zn, Ni, and Cu) in the muscle and liver of Longtail tuna (<em>Thunnus tonggol</em>) and Abu mullet (<em>Liza abu</em>) and to evaluate human health risks associated with their consumption Fish samples were obtained from a fish market in the Bandar Abbas city in the spring 2015. The concentrations of. heavy metals were determined using atomic absorption spectroscopy. The concentrations of copper in the muscles of Longtail tuna and Abu mullet were lower than the international standard limits, whereas the concentrations of cadmium in the muscles of Longtail tuna and Abu mullet were higher than the international standard limits of WHO, NHMRC and UKMAFF. The concentration of zinc in the muscle of Longtail tuna was higher than the international standard limits of WHO. Estimation of Target Hazard Quotient (THQ) and Hazard Index (HI) for children and adults by consumption of the muscles of Longtail tuna and Abu mullet were lower than 1. Estimation of THQ and HI for children and adults by consumption of the liver of Longtail tuna and Abu mullet were higher than 1 for cadmium and copper. Therefore, it can be concluded that there is no human health risk associated with the consumption of the muscle of Longtail tuna and Abu mullet whereas consumption of their livers is not recommended more than once a week<strong>.</strong><br>
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Abolfazl NajiEffect of Lactobacillus plantarum on survival rate, biochemical and immunity parameters of Artemia hemolymphhttp://isfj.ir/browse.php?a_id=1871&sid=1&slc_lang=en
Because of the fact that improving hosts immunity is one of the most important applications of probiotic, the effect of probiotic <em>Lactobacillus plantarum</em> on survival rate, biochemical and immunity parameters of <em>Artemia </em>were investigated in this study. For this purpose, <em>Artemia urmiana</em> cysts were desiccated and hatched according to the standard methods. This experiment was carried out in three treatments with three replications for each treatment. Different treatments contained various levels of probiotic <em>Lactobacillus plantarum</em> including 0 (C), 10<sup>3</sup> CFUml<sup>-1</sup> (P3) and 10<sup>6</sup> CFUml<sup>-1</sup> (P6). The duration of the test period was 10 days. The results showed that the percentage of hatch, survival rate, biochemical indices and the immune parameters of <em>Artemia </em>were improved. The highest survival rates were observed for the treatments containing probiotic with the level of 90&plusmn;3.33% in P3 and 93.50&plusmn;1.70% in P6 which were significantly different as compared to that of the control group (P˂0.05). Biochemical parameters such as the levels of total protein, albumin and lysozyme were increased, whereas the level of cortisol in <em>Artemia </em>was decreased. In addition, the highest levels of immune parameters of <em>Artem</em><em>ia</em> such as the immunoglobulin and phenol oxidase activity were observed in the P6 treatment with the amounts of 95.60&plusmn;3.50and 167.76&plusmn;16.16 percent, respectively. Other indicators such as the alanine aminotransferase and aspartate aminotransferase were lower in the treatments containing probiotic as compared to those of the control group indicating a positive effect of this probiotic on these parameters.<br>
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&nbsp;Ali AberoumandEvaluating the stability and controlling the oxidation rate of Rainbow trout fish oil (Oncorhynchus mykiss) in nanocapsules containing clove essential oil (Syzygium aromaticum)http://isfj.ir/browse.php?a_id=1783&sid=1&slc_lang=en
<p>The aims of this study were to evaluate the effects of three independent variables including the percentage of total biopolymer (6, 8 and 10%), fish oil content (2 and 3%) and concentration of clove oil (0, 2000 and 3000 ppm) on two dependent oxidative variables including the peroxide value (PV) and thiobarbituric acid (TBA) during 3 months of storage at 4 and 25&deg;C. Evaluating the results after three months of storage indicated that the amounts of PV and TBA of the encapsulated fish oil were significantly lower than those of the control group (P<0.05). Furthermore, the amounts of PV and TBA of the encapsulated fish oil stored at 4&deg;C were lower than the amounts of PV and TBA of the encapsulated fish oil stored at 25&deg;C. The amounts of TBA of the encapsulated fish oil containing clove essential oil were decreased by increasing the amounts of clove essential oil (P<0.05) and the stability of oil was decreased by increasing the percentages of fish oil (P<0.05). Overall, it can be concluded that using 10% biopolymer, 2% fish oil and 2000 ppm clove essential oil were capable to preserve the fish oil stability during three months of storage at 4&deg;C, whereas using 8% biopolymer, 3% fish oil and 3000 ppm clove essential oil were effective in preserving the fish oil stability during three months of storage at 25&deg;C.<br>
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A JafarpourDetermination of numerical scale of water quality based on the algal bloom potential in the southern Caspian Sea-Goharbaran (Mazandaran Provience)http://isfj.ir/browse.php?a_id=1782&sid=1&slc_lang=en
<p>A growing human population and increased demand for protein will made marine aquaculture inevitable. Water quality monitoring is important due to the great interactions between water quality and aquaculture activities. Therefore, the present study was performed because of the importance of the phytoplankton studies in the environmental and monitoring studies in order to scale water quality based on the algal bloom potential in the southern Caspian Sea-Goharbaran where can be used for cage and pen fish farming. Water samples were collected monthly from different layers of water (surface, 5 and 10 m) at various depths (5, 10 and 15 m) during 2013-2014. Based on the results, the algal bloom threshold for phytoplankton abundance, phytoplankton biomass and chlorophyll-<em>a</em> concentration were 200 million cells/m<sup>3</sup>, 512 mg/m<sup>3</sup> and 1.7 &micro;g/L, respectively. The abundance of <em>Binuclearia lauterbornii</em>,<em> Thalassionema nitzschioides </em>and<em> Pseudonitzschia seriata</em> were in the medium class of algal bloom in the summer, autumn and winter, respectively. The scaling of water quality based on the algal bloom were defined as excellent from April to June, fine-medium in September and in October and medium-weak from January to early March. In the present study, using various parameters of phytoplankton (abundance, biomass and chlorophyll-<em>a</em> concentration) and evaluating biological and ecological characteristics of dominant phytoplankton species were increased the validity of the numerical scalling of water quality.<br>
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H Nasrollahzadeh Saravi Effects of physicochemical parameters of water on seasonal variation, distribution and density of crustacean zooplankton communities in Sulduz Wetland (Southern parts of Urmia Lake)http://isfj.ir/browse.php?a_id=1842&sid=1&slc_lang=en
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Due to the progressive drying of Urmia Lake, applying appropriate management strategies and providing a suitable solution for the management of hydrological regimes in the satellite wetlands around this lake such as the Sulduz Wetland is necessary. The Sulduz Wetland is located in the West Azerbaijan Province and in the southern part of Urmia Lake. The Sulduz Wetland is ecologically important. The present study was conducted to investigate the role and the effect of physicochemical factors of water on the crustacean zooplankton communities. Sampling was performed seasonally from November 2015 to July 2016. Two groups of crustacean zooplankton including Copepoda and Cladocera were observed<strong>.</strong> The results of statistical analysis of CCA showed a positive correlation between the existence and density of most of the genera with the temperature, turbidity, soluble solids, dissolved oxygen, phosphate and alkalinity, whereas same genera showed a negative correlation with depth, salinity, electrical conductivity, transparency and pH. Low water temperature in the autumn and in the winter was the main factor in reducing the density of zooplankton in this wetland. Results of CCA analysis showed that the presence and density of identified genera were related to each other and to the physicochemical parameters of water. In conclusion, it can be said that in the Sulduz Wetland like many other habitats of the world, distribution patterns of zooplanktons were strongly influenced by environmental factors.<br>
&nbsp;K sarvi moghqanjouFishery management based on relative yield-per-recruit model for the Largehead Hairtail (Trichiurus lepturus) stocks in the Persian Gulf and Oman Seahttp://isfj.ir/browse.php?a_id=1845&sid=1&slc_lang=en
Among the several fish species commercially exploited at the Persian Gulf and Oman Sea waters, the Largehead hairtail, <em>Trichiurus lepturus</em>, stands as one of the most influential groups that have been recently exploited for export to outside markets. In the current study, we applied the Beverton and Holt's relative yield per recruit model to provide management guidance and determine the biological reference points (i.e. E<sub>0.5 </sub>and E<sub>max</sub>) for <em>T. lepturus</em> stock in the coastal waters of Iran. The von Bertalanffy growth equation (VBGF) was fitted to length&ndash;frequency data (n =1309) to obtain a VBGF with the following parameters: L<sub>&infin;</sub>=111.3 cm total length; K=0.41 and t<sub>0</sub>= -0.28 years. The estimated value of total mortality (Z) based on length converted catch curve method was 1.11 year<sup>-1</sup>. Natural mortality (M) based on growth parameters was 0.67 year<sup>-1</sup> while fishing mortality (F) was recorded as 0.44 year<sup>-1</sup>. Maximum exploitation rate (E<sub>max</sub>), corresponding to the maximum relative yield per recruit was E<sub>max</sub> = 0.62. The stock was not overexploited, since E < E<sub>max</sub>. The present results have to be considered with caution to fisheries management purposes as fishing effort is still in increasing phase. The long-term monitoring is required to better understand the <em>T. lepturus</em> population dynamic and its fishery framework in the study region.<br>
&nbsp; M. Ghodrati ShojaeiStudy on antibacterial effect of chitosan containing silver oxide and modified bentonite with cationic surfactant against Yersinia ruckeri isolated from rainbow trout (Onchorhynchus mykiss)http://isfj.ir/browse.php?a_id=1856&sid=1&slc_lang=en
In this study, the antibacterial effects of modified bentonite with cationic surfactant and chitosan containing silver oxide against Yersinia ruckeri were investigated under laboratory conditions. These antimicrobial compounds were prepared with bentonite modified with cationic surfactant Tetradecyltrimethylammonium bromide and chitosan modified with silver oxide. The X-ray diffraction (XRD) and Fourier transform infrared (FTIR) spectroscopy for determination of the structures of bentonite and chitosan composite containing silver oxide showed that the surface and layer structures of them were changed by modification. The antibacterial effects of the two types of antimicrobial compounds on gram-negative bacteria Yersinia ruckeri under laboratory conditions were investigated according to the disk diffusion and macrodilution methods. The results of the disk diffusion method indicated that these compounds had antibacterial properties. The minimum bactericidal concentration (<em>MBC</em>) and the minimum inhibitory concentration (<em>MIC</em>) were determined by the use of microdilution method and counting&nbsp;of&nbsp;colonies&nbsp;on agar plates. The zone of inhibition of chitosan containing silver oxide and modified bentonite were 5.63&plusmn;0.53 and 1.2&plusmn;0.16 mm, respectively. The minimum bactericidal concentrations (<em>MBC</em>) of chitosan containing silver oxide and the modified mineral clay compound against Yersinia ruckeri in 10 minutes were 28.57 and 42.85 mg/L. The minimum inhibitory concentration (MIC) of chitosan containing silver oxide and modified clay in 10 minutes was 14.28 mg/L. The results of this study showed that modified bentonite and chitosan containing silver oxide had strong antimicrobial effects and the ability to kill pathogens under laboratory conditions. The bactericidal effect of chitosan containing silver oxide was stronger than the bactericidal effect of modified bentonite clay.<br>
&nbsp;Z. Shokouh Saljoghi Physicochemical conditions and trophic levels of the Anzali Wetlandhttp://isfj.ir/browse.php?a_id=1858&sid=1&slc_lang=en
Anzali wetland is one of the most important wetlands in the southern coast of the Caspian Sea which is under the influence of the brackish water of the Caspian Sea and the freshwater rivers entering it. Therefore, it plays important role as an exclusive ecotone. Physicochemical conditions and trophic levels of the Anzali Wetland were evaluated monthly from May 2014 to May 2015. Trophic State Index (TSI) was calculated based on the evaluation of chlorophyll a, total phosphorus (TP), total nitrogen (TN) and water transparency. The results showed that the average annual amounts of total nitrogen, total phosphorus and dissolved oxygen were 1.023&plusmn;0.523, 0.113&plusmn;0.105 and 8.71&plusmn;2.63 mgL<sup>-1</sup>, respectively. The amounts of total nitrogen were not significantly different among various research locations (P>0.05), whereas the amounts of total phosphorus were significantly different among various research locations (P<0.05). The amounts of chlorophyll a ranged from 0.6 to 329.1 &micro;gL<sup>-1</sup> (with the average amount of 47.4&plusmn;65.0 &micro;gL<sup>-1</sup>). The amounts of EC ranged from 254 to 14250 &micro;m/cm which were significantly different among various research locations (P<0.05). The TN/TP ratio was lower than 10 in all research locations except in the western part of the Anzali Wetland which indicated that phosphorus was the limiting factor for eutrophication. According to the results, the western part of the Anzali Wetland and Siah-Keshim area were eutrophic and super-eutrophic, whereas the other regions of the Anzali Wetland were classified as hypereutrophic. Controlling and decreasing the amounts of nutrients from inlet waters and controlling the growth of aquatic plants in the Anzali Wetland can be used to improve the quality of water and to control eutrophication.<br>
&nbsp;A. AbediniDietary effect of celmanax® on growth factor, intestine histology and yersiniosis resistance in rainbow trout (Oncorhynchus mykiss)http://isfj.ir/browse.php?a_id=1869&sid=1&slc_lang=en
This study aims to analyse the effect of complementing the rations of breeding rainbow trout with different concentrations levels of celmanax&reg; prebiotic, which contains <em>Saccharomyces cerevisia</em> associated compounds with Mannan<span dir="RTL">-</span>oligosaccharide on the growth indexes and histologic effects of the prebiotic and the gastrointestinal tract and also measuring of the resistance of breeding fishes fed with this prebiotic in infection to the yersiniosis. Three concentration levels of prebiotic (0, 0.1, 0.5 and 1 %) were mixed into pellets. The fish (19.08&plusmn;1.45gr) were fed a supplemented commercial diet for 60 days in four treatments and each treatment with three replications. Also, on day 60 of study, the <em>Yersinia ruckeri</em> bacterium was injected empirically into all of our groups. This study&rsquo;s results showed that complementing rainbow trout rations with different concentrations level of celmanax<sup>&reg;</sup> (P<0.05) increased the final weight, daily growth rate, specific growth factors, Food efficiency index and feed conversion so significantly. Histopathologic results also showed significantly changes namely, increase in the thickness of the mucous membranes, length of the villi and the muscle layer in the gastrointestinal tract of the fish which where fed with prebiotic in comparison with the control group (P<0.05). The results also showed that those fish that where fed with prebiotic had significantly lower death rates compared to the control group (p<0.05). According to these findings, it can be concluded that different concentrations level of celmanax<sup>&reg;</sup> prebiotics could be used in order to increase the growth, histological changes in the gastrointestinal tract and rainbow trout resistance.A. Haghighi Effect of dietary Lactobacillus casei and different levels of immunogen on the activities of immunological and hematological factors of Cyprinus carpiohttp://isfj.ir/browse.php?a_id=1743&sid=1&slc_lang=en
The aim of this study was to evaluate the effects of synbiotic <em>Lactobacillus casei</em> PTCC 1608 and immunogen prebiotic on immunological and hematological factors of <em>Cyprinus carpio</em>. 300 fish (with the average weight of 40 g) were fed for 75 days with various diets including the diets containing 0.5 (A), 1 (B) and 1.5% (C) immunogen and <em>L.casei</em> probiotic with the concentration of 5&times;10<sup>7</sup> CFU/g, treatment D contained only <em>L.casei</em> probiotic with the concentration of 5&times;10<sup>7</sup> CFU/g and the control treatment without synbiotic (E). Results showed that the levels of white blood cells in the treatment A, B and C on day 60 were significantly different as compared to day 0 and the control group (P<0.05). The levels of red blood cells in the treatment A, B, C and D on day 30 were at the highest level and were significantly different as compared to day 0 and the control group (P<0.05). The levels of lysozyme in the treatment C and D until day 30 and in other treatments until day 60 were significantly different from the control group (P<0.05). The administration of synbiotic in the treatment C and D on respiratory burst activities on day 30 and in other treatments until day 60 and the level of complement on day 60 in the treatment A were significantly different as compared to those on day 0 and the control group (P<0.05). The results suggested that dietary administration of synbiotic can improve some immunological and hematological parameters and the best level of immunogen was 1% with synbiotic L. RoomianiThe effect of garlic extract (Allium sativum) on immune system and blood biochemical composition in the Oscar fish, Astronotus ocellatushttp://isfj.ir/browse.php?a_id=1811&sid=1&slc_lang=en
In this study, changes on biochemical and immune parameters of Oscar fish, <em>Astronotus ocellatus</em> under the influence of garlic extract has been studied. A total of 300 Oscar (initial weight 8/37 &plusmn; 0/36 g) were distributed in four treatments and each treatment was diet with garlic extract supplement, (0.0%, 0.5%, 1.5% and 2.5%). Period test was 8 weeks. The samples were taken and biochemical parameters such as total protein, albumin, globulin, triglycerides, cholesterol, aspartate aminotransferase (AST), alanine aminotransferase (ALT) and alkaline phosphatase (ALP) and immune parameters such as C3, C4 and lysozyme activity were measured by standard methods. Total protein and albumin increased in fish fed with the extracts of garlic 1.5%, but no significant difference was observed in globulin in four treatments. Triglycerides, cholesterol, ALP and AST in all treatments fed garlic extract were decreased. Safety parameters include C3 and C4 treated in samples with the extracts of garlic 1.5% and lysozyme activity increased in all treatments. The results of this study showed that garlic extract has positive effects on biochemical and immune indicators in Oscar fish and the best observed was in the treatment with 1.5%&nbsp; garlic extract.<br>
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&nbsp; N. GhotbeddinEvaluating the law of one price in ornamental fish market in Iranhttp://isfj.ir/browse.php?a_id=1564&sid=1&slc_lang=en
<p>The main objective of this paper is to investigate the law of one price for ornamental fish market in Iran. To achieve this, the domestic and world prices of ornamental fish were examined monthly from the beginning of 2009 to the end of 2014. &nbsp;<a href="https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=2&ved=0ahUKEwj1vprl1PrSAhWELsAKHR76CRIQFggpMAE&url=http%3A%2F%2Fwww.wiwi.uni-frankfurt.de%2F~hassler%2Fha-wo-revision.pdf&usg=AFQjCNEfJ-40K0dJPgJVsuLxox6Hz6DvIQ&sig2=F4zwH7ULNOlT3LcaxEOS3Q&bvm=bv.150729734,d.ZGg">Autoregressive Distributed Lag</a> (ARDL) models were used to analyze data. To evaluate the law of one price in ornamental fish market in the short-term and long-term periods, the impact of world price of ornamental fish on its domestic price was examined. According to Autoregressive Distributed Lag model in the short term period, the effects of domestic price from the last month were studied on the current month of investigation in addition to the effects of foreign prices. As a result of the econometric analysis, the global price of the ornamental fish had a positive and significant effect on the domestic price of fish in the short-term and long-term periods in addition to the positive effects of domestic price of fish from the last month on the current month in the short term period. In other words, the law of one price for the ornamental fish market was significantly accepted in the studied years. The estimated error correction factor in the ornamental fish market was 0.31 which indicated that in any time period 31% of short-term imbalance could be corrected. Therefore, adopting the required supportive policies is recommended to reduce the domestic prices sensitivities of the ornamental fish to their global price fluctuations.<br>
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Investigating heavy metals (Cu, Zn, Fe and Se) bioaccumulation in muscle, liver and gill tissues of Pomadasys kaakan from the Bushehr porthttp://isfj.ir/browse.php?a_id=1973&sid=1&slc_lang=en
The aim of this study was to investigate the bioaccumulation of heavy metals (Cu, Zn, Fe and Se) in the muscle, liver and gill tissues of <em>Pomadasys kaakan</em> from the Bushehr port during the year 2017. Biometry of fish samples was performed. Then, the muscle, liver and gill tissues were separated from the fish samples and chemical digestion of the samples was conducted. Cu, Zn, Fe and Se accumulation levels in various tissues were measured using Graphite furnace atomic absorption instrument (Perkin Elmer 3030). Based on the results, the average concentrations of heavy metals including Cu, Zn, Fe and Se in the muscle of <em>Pomadasys kaakan</em> were 7.620&plusmn;0.035, 25.710&plusmn;2.570, 2.620&plusmn;0.166 and 0.101&plusmn;0.006 mg/kg dry weight, respectively. The average concentrations of Cu, Zn, Fe and Se in the liver were 8.420&plusmn;0.149, 31.401&plusmn;1.020, 3.070&plusmn;0.155 and 0.108&plusmn;0.009 mg/kg dry weight, respectively. The average concentrations of Cu, Zn, Fe and Se in the gill were 9.900&plusmn;0.110, 34.740&plusmn;1.070, 4.400&plusmn;0.240 and 0.133&plusmn;0.011 mg/kg dry weight, respectively. Significant differences in the concentration levels of heavy metals were observed among different tissues (P<0.05). Moreover, the results of this study revealed that the levels of Cu, Zn and Se in the muscle of <em>Pomadasys kaakan</em> from the Bushehr port were lower than the permitted levels by international standards (WHO, FAO, NHMRC, UK (MAFF) and FDA). However, concentration of Fe in the muscle of <em>Pomadasys kaakan</em> from the Bushehr port was higher than the permitted levels by FDA.<br>
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&nbsp;Farshad Ghanbari